The atmospheric chemistry that leads to photochemical smog and climate-active aerosols
requires the presence of volatile organic compounds (VOCs)(1, 2). The VOCs in urban air …

Many types of aerosols have lifetimes long enough for their transcontinental transport,
making them potentially important contributors to air quality and climate change in remote …

THERE is evidence from records of ground-level measurements1–6 that the average
tropospheric concentration of ozone in the Northern Hemisphere has increased. In …

Forests emit large quantities of volatile organic compounds (VOCs) to the atmosphere. Their
condensable oxidation products can form secondary organic aerosol, a significant and …

WHEN fossil fuel is burned, both carbon dioxide and sulphur dioxide are added to the
atmosphere. The former should cause warming of the lower atmosphere by enhancing the …

Abstract The Sahara Desert is the largest source of mineral dust in the world. Emissions of
African dust increased sharply in the early 1970s (ref.), a change that has been attributed …

Each year, more than 4 million people die early because of outdoor air pollution, according
to the World Health Organization (WHO). The main culprits are fine particles with diameters …

Nearly three-quarters of the growth in global carbon emissions from the burning of fossil
fuels and cement production between 2010 and 2012 occurred in China,. Yet estimates of …

OXYGENATED species in the atmosphere are important sources of free radicals and are
intricately linked with the fate of nitrogen oxides (NO x), which are themselves necessary for …

THE presence in Norway of long-range transported air pollutants from the European
continent and England is well established. In particular, SO2 and other inorganic …